John c



l. C. WAHL.

CALCULATING MACHMJE.

APPLICATION FILED him/23,1918.

Patented NOV. 25, 1919} 3 SHEETSSHEET 1.

J C. WAHL.

CALCULATING MACHINE.

APPLICATION FILED HAY 23, 1915b lnmntcd Nov. 25, $19;

3 SHEETS-SHEET 2.

J. C. WAHL.

CALCULATING MACHINE.-

APPLICATION FILED MAY 23. 1918.

Patented Nov. 25, 1919.

3 SHEETSSHEET 3.

UNITED STATES PATENT OFFICE.-

JOHN C. WAI-IL, OF CHICAGO, ILLINOIS, ASSIGNOR T WAHL COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE.

CALCULATING-MACHINE.

Specification of Letters Patent.

Iatented Nov. 25, 1919.

Application filed May 23, 1918. Serial No. 236,216.

. To aZZ whom it may concern Be it known that I, JO N C. IVAHL, a.

citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Calculating-Machines, of which the followingis a specification. My invention is a typewriter calculating machine, and particularly relates to such a machine provided with a single totalizer and automatic mechanism to bring said totalizer into cooperation with the various zones of calculation on the-typewriter worksheet, whereby numbers written in horizon .tal arrangement may be added and subtracted.

My invention further comprises means by which a certain program of calculation may be lset upon the typewriter carriage and as suchcarriagetravelsfrom Zone to 'zone, the calculating mechanism will be automatically thrown into position for subtraction, according to the program which has been set up on the typewriter carriage.

My invention further prov1des means by which this automatic control may be thrown out of action-and the machine put into manual control. This is for the purpose of the correction of errors, or'for the purpose of temporarily throwing the machine into man- .ual controLfor the purpose of computing a problem which requires a program ofcalculation different from that set up on the y typewriter carriage.

' The above and other objects of my inven- 171011 willbe apparent to those skilled in the art on a perusal of the following specification'and claims. I Y

,My invention may be best understood by reference to the following figures, of which Figure l is a front view of the mechanism peculiar to my invention; Fig. 2 is a plan view along igfis zip perspective view of the gear shifting'devices;

Fig.. 4 is a section along the line 44 of the line 2 2 one space.

taken on a somewhat smaller scale than the remainder of the figures.

Similar reference. numerals refer to like parts in all the figures.

Referring particularly to Figs. 1 and 2, 10 represents the frame of a Remington typewriter which is provided with the usual typewriter mechanism, including a moving carriage for holding the worksheet, letter keys for writing letters thereon, and digit keys for writing figures thereon, said digit eys being attached by pull rods 11 to the actuator of the calculating machine. The calculating attachment is of .the well known Wahl type. It consists of an actuator 19. and a totalizer13. Numbers are inserted into the totalizer 13 by a master wheel 14, which is revolved a number of spaces corresponding to the particular digit keyv operated by the well known lVahl mechanism.

The lVahl mechanism present in both the actuator 12 and totalizer 13 has been thoroughly described in my issued Patent No. 893,719, July 21, 1908, and need not be further described in this place.

My invention is also suitableto be used with the later actuating mechanism shown in my issue Patent No. 1,148,733, August 3, 1915. In both of the mechanisms referred to the general operation is as follows: Each of the digit keys of the typewriter is connected to the actuator by the pull rod 11, as before noted, and theactuator mechanism 'serves'to transform a vertical motion of a digit key into a rotation of the master wheel 14 a number of spaces, depending on the particular digit key which has been operated. For example, if the ,l-key has been operated, the master wheel will rotate If the Q-key has been operated, it will rotate two spaces, etc. The direction of rotation of the masterwheel ensuing upon the operation of a digit key is determined by the position of a gear shift putation.

rod 15. When said rod is in the position shown in Fig. 2, the'master wheel 14 rotates in a direction to. determine addition. When the rod 15 is thrown to the left, the master wheel rotates in a direction to determine I subtractionf The mechanism by which this gear change is brought about is very well described in either of my cited patents. will hereinafter be described, the totalizer 13 advances step by step to the left (Figs. 1 and 2) as the digit keys of the typewriter are operated and thus the master wheel 14 serves to insert a number in the totalizer 13 digit by digit. In inserting a number, the typewriter, which of course may be provided with the ordinary tabulating mechanism, is tabulated sothat the totalizer engages the master wheel in the decimal order in which is the first significant digit of the number to be inserted. The digit keys are then operated in a sequence corresponding to the digits of the inserted number and the totalizer 13 will show the total of the numbers thus inserted.

When all the items of a calculation have been inserted and it is desired to write the total of the numbers included in said calculation, the gear shift rod 15 is'shifted to the left (Figs. 1 and 2), thus throwing the machine into subtraction. The digit keys are then operated in a sequence corresponding to the total appearing on the totalizer. This will result in subtracting the number present in the totalizer, leaving it clear and the machine ready for a new com- I shall now describe the'mechanism peculiar to my present invention.

Mounted on the frame 10 of the typewriter is a bar 16, which serves as a raceway for a truck 17, having mounted on its back sides rollers 18 and 19, which en gage suitable ways 20 and 21 on the bar 16. There are two of the rollers 18 on' the up per side of the truck and also two of the rollers 19 on the lower side of the truck. Thus the motion of the truck 17 is confined to a longitudinal motion relative to the typewriter framing 10. On the right end of the truck 17 is a lug 22, having a screw 23 mounted therein, which is embraced by a fork 24, on an arm 25 rigid to the types writer carriage 26. The entire truck will thus advance step by step to the left (Fig. 1) synchronous with the letter space advance of the typewriter carriage.

The front of the truck 17 is made with dovetailed sections 27 and 28, said sections 27 and 28 extending the entire length of the truck. The totalizer 13 slides in said section since it has its side plates 29 and 30 provided with dovetails 31 and 32 to fit into the dovetails 27 and 28. The totalizer 13 may thus slide freely along the truck 17.

Mounted on the truck 17 is a framework typewriter.

consisting of side plates 33 and 34, which serve as a mounting for a shaft 35 rotatably mounted between said side plates and also for a cam bar 36, which is provided with a series of locating holes 37, which serve as locations for a calculation cam 38 secured in said holes by suitable screws 39 and 40. A series of lugs 41, 42, 43 and 44 are rigidly mounted on the shaft and may be secured in any desired position, corresponding to a desired calculating zone by set screws 45.

A spiral spring 46, secured between the lug 44 and the side plate 34, tends to rotate the shaft 35 in a. counter-clockwise direction (Fig. 4). The lug 41 has extending from it plate 30 of the totalizer 13. A spring 51 is attached between the totalizer 13 and an arm 52 rigid to the framework 10 of the A disengaging lug 53 is mounted on the framework 10 of the type writer and serves to release the arms 49 from the lugs 50 when the totalizer has reached a position in which the master wheel 14 has passed beyond the lowest decimal place of the totalizer 13. The lug 53 is provided with an incline 54 extending to the right, and an incline 55 extending to the left, and for the purpose of enabling the arms 49 to pass freely over said lug.

The arm 52, which, as before noted, is rigid with the framework 10 of the type writer, has a forwardly extending portion 56 which contacts with the right side plate 30 of the totalizer 13 and thereby determines a normal position for said totalizer.

From the preceding it will be obvious that as the typewriter carriage progresses to the left (Fig. 1), the lug 50 will be picked up successively by the arms 49, rigid with the lugs 42, 43 and 44, and as said arms reach the incline 54 of the lug 53, the shaft 35 will be rotated against the tension of the spring 46 and thus disengage the arm 49 from the upwardly extending lug 50. The totalizer 13 will then be drawn to the right by the spring 51 until the upwardly extending lug 50 is engaged by the next succeeding arm 49. The totalizer will again move step by step to the left, synchronous with the movement of the typewriter carriage. until the engaged arm 49 encounters the incline 54, when the disengagement of the totalizer from the shaft will be repeated.

When the typewriter carriage is pulled to the right, the shaft 35 will be rotated as the successive arms 49 encounter the incline 55 of the lug 53. It wil'lhe noted that. the upwardly extending lug 50 is provided with an inclined surface also for the purpose of alloWingthe arms 49 to ride over said'lug as the typewriter carriageis pulled to the right.

From the above mechanism it is evident engagement with the typewriter carriage and move with said carriage whenever said carriagereaches a position determined by the lugs 42, 43 and 44. As before noted, these lugs may be set to any desired position along the shaft 35, and therefore different zones of calculation maybe defined.

I shall now describe the means by which the machine is automatically thrown into subtraction during the motion of the type Writer carriage 26: Referringto Fig.3, which is a perspective view of the parts comprising the automatic subtracting v mecha-.

nism, it will be seen that the gear shift rod 15-is provided with a series of teeth 57 on the under side thereof, andthat said rod is half cutaway in a flat portion 58.- Rotatably mounted on the rod 15 is a fork 59, which is constrained against lateral motion on said rod by a pin 60 extending through the hub 61 0f the fork 59 and engaging a groove 62 in the shaft 15. Rotation of the shaft 15 with respect to the fork 59 therefore is permitted. 1

A shaft 63 is rotatably mounted in the framework of the machine on a bracket 64 rigidly attached to said framework, and a gear wheel 65 is rigidly mounted on the rear end of saidshaft and engages the teeth 57. On the front of said shaft is rigidly mounted a pinion 66, engaging with which is a segmental gear 67 ona lever 68 rotatably mounted on a stud screw 69 rigid on the framework 10. A pin 70 is mountedon the front end of the lever 68' and is adapted to be engaged by the cam 38 and moved down wardly. Obviously, when the cam 38 engages the pin 7 O, the lever 68 will be rotated in a clockwise direction (Fig. 3), which will result in the shifting of the subtraction rod 15 to the left, and consequent throwing of the actuator in its subtracting condition.

A compression spring 71 surrounds the gear-shift rod 15 and engages a collar 72, rigid on said' shaft, and a portion of the framework 10 of the typewriter. The gear shift rod 15 is thus urged to the right by the spring 71, and consequently the machine will return to its adding position upon disengagement of the cam 38 with the pin 70.

WVhile I have shown only one cam 3-8, it is obvious that-any number m'ayrbe employed and that they may be located in any desired position on the cam bar 36; In Fig. 1 of the accompanying drawings'I have shown, in dotted lines,. a second cam 38, which is mounted on the bar 36 by screws 40'.

The cams 38 and 38' may be located in any desired position to correspond to desired 'zones on the worksheet, it being understood ing the machine from its automaticcontrol that the totalizer 13 will be brought into into its manual control.

The gear shift rod 15 extends to the left and has rigidly mounted on it a handle 73. The gear shift rod- 15 is also provided with two longitudinal groeves 74 and 75, which are adapted to be engaged by a plunger 76, Which slides'in a bearing 77, rigid on the framework 10 of the machine. A compression spring 78, extending between a collar 79 on the plun er 76 and a plug 80, which serves the double purpose of providing a rear bearing for the plunger 26 (Fig. 5) and a bearing for the spring 78. The plunger 76 is thus 511W! ys urged into one of the longitudinal grooves 74 or 75, and when 10- cated in either of said grooves will prevent the gear shift rod 15 from turning. When it is desired to put the machine into manual control, the handle73 is turned through a right angle. This will disengage the teeth 57 from the gear 65 and will bring said handle into engagement with a bracket 81 provided with notches 82 and 83, into which the handle 73 may be located.

In order to take care of the lever 68 during the time when the teeth 57 are disengaged from the gear 65, I have provided a spring 84, which extends between the lever 68 and a lug 85 rigid on the framework 10 of the typewriter. A stop 86 on the framework 10 of the typewriter serves to limit the upward motion of the right hand end of the lever 68 (Fig.

The ability to disable the automatic control of the machine and put it into manual control is of great value in making corrections of a wrong number which has beeninserted in the machine. As an example of this, suppose the machine was in subtraction,

that is, the cam 38 was engaged with the pin 70 and one inserted the number 35 into the machine when one wished to insert the number 36. In order to correct this error, the machine would be'brought so that the master wheel 14 would engage the totalizer 13 in its last decimal place. The handle 73 would then be rotated through 90 andlocated in the notch 82, thereby determining that the machine should operate in*addition.

' The 5 digit key is then operated, which will the teeth 57 were disengaged from the gear 65, and the plunger 76, by reason of it engagement with the longitudinal groove 75, prevents further rotation of the gear shift rod 15. The 6-key is their operated, thus entering a 6 into the totalizer'in subtraction. The result of these operations will of course be the insertion of the correct number, 86, into the totalizer in subtraction.

Many changes may be made in the precise structure herein shown withoutdeparting from the spirit of my invention, since I claim 1. In a calculating machine, the combination of a totalizer slidably mounted with reference to the framework of the machine, a moving carriage, a bar on said moving carriage having'aseries of connecting locations thereon, said locations being adapted to pick up said totalizer, and meansfor giving said bar arotary motion when it has reached a predetermined position relative to the frame.

2. In a calculating machine, the combination of a totalizer, a moving carriage, said totalizer being slidably mounted relative to said moving carriage, a bar'rotatably mounted in said moving carriage, a series of lugs on said bar, and means adapted to contact with said lugs,.thereby rotating said bar at predetermined positions of said moving carriage.

3. In a calculating machine, the combination of a moving carriageya bar rotatably mounted thereon, adjustable lugs mounted on said bar, and means to cooperate with said adjustable lugs and slightly rotate said bar thereby when said moving carriage has reached a predetermined position.

4. In a calculating machine, the combination of a moving carriage, a bar rotatably mounted thereon, a series of lugs mounted i on said bar, and means to contact with said lugs in succession and rotate them, whereby said bar may be slightly rotated at predetermined positions of said moving carriage.

5. In a calculating machine, the combination of a moving carriage, a totalizer slidably mounted thereto, a lug on said totalizer, a bar rotatably mounted with reference to said carriage, a series of lugs mounted on said bar and adapted to engage with said tota-lizer lug, and means tending to rotate said'bar, whereby said lugs are held in engagement with said totalizer lug.

6. In a calculating machine, the combination of a moving carriage, a totalizer slidably mounted thereto, a rotatable bar mounted on said moving carriage, and means on said bar to intermittently and repeatedly pick up said totalizer to move it synchronously with said carriage.

7. In a calculating machine, the combination of a decimal carriage, a moving carriage, said decimal carriage being slidably mounted relative to said moving carriage and being adapted to be intermittently connected therewith, a bar rotatably. mounted in said moving carriage, a series of lugs on said bar, said lugs being adapted to be connected to said decimal carriage, aiid means adapted to contact with said lugs, thereby rotating the said bar at predetermined positions of said moving carriage.

8. In a calculating machine, the combination of a decimal carriage, a moving carriage, said decimal carriage being slidably mounted relative to said moving carriage, a bar rotatably mounted in said DIOViDgiflfriage, a series of lugs on said bar, means located on said decimal carriage adapted to contact with said lugs, and means located .'on the framework of the machine also adapted to contact with said lugs, thereby rotating said bar at predetermined positions of said moving carriage and disconnecting said decimal carriage therefrom.

9. In a calculating machine, the combination of a moving carriage, a decimal carriage slidably mounted thereto, a lug on said .decimal carriage, a bar rotatably mounted on said moving carriage, a series of lugs mounted on said bar, each of said lugs being adapted to engage with said decimal carriage lugs, and means adapted to rotate said bar whereby said lugs are held in engagement with said decimal carriage lug.

10. In a calculating machine, the combination of a moving carriage, a decimal carriage slidably mounted thereto, a rotatable bar mounted on said moving carriage, and means on said rotatable bar to intermittently and repeatedly pick up said decimal carriage and move it synchronously with said moving carriage.

11. In accalculating machine, the combination of a totalizer, means to enter a number therein, a gear control forsaid number-entering means, a moving carriage; a cam' on said moving carriage adapted to operate said gear control, said gear control including a rotatable shaft having teeth on one edge 'thereof and having a flat on another edge thereof.

12. In a calculating machine, the combination of a moving carriage, a cam on said moving carriage, a lever operated by said ca a gear wheel operated by said lever, a rod adapted to be'operated by said gear wheel, said rod having teeth on one side and a flat on another side and being revolu- -ble, whereby said rod may be revolved to thereby disconnect it from said gear.

13. In a calculating machine, the combi- 'nation of a moving carriage, a gear shift -hy when-es aid od is revolved, said carriage side thereof, whereby when said rod is reis ineffective t0 Tn'df e it. J volved', said gear shift is disconnected from 14. In a calculatingmachine, the combithe control of said gear. nation of a gear shift device including a In Witness whereof I have hereunto sub-- 5 gear and a longitudinally shiftable rod, said scribed my name.

rod being also revoluble and'having teeth on one side thereof and .a flat on another JOHN C.-WAHL. 

